There are 2 repositories under object-oriented-database topic.
Open Source Database Manager Made in WinForms that copies CastleDB's UI structure. It also has unique features for the purpose of further automating database management.
Husk: Embedded, Object-Oriented Database
A simple application for shop owners who wants to track their sales and inventory through excel file. All inputs and outputs are done through excel files. CSE215 project for North South University students.
Practicing Database and object Oriented Database using SQL
Database Architectures - Practical Assignment #1
Modelo en objetos de base de datos transporte
Ejemplos de programación con db4o (BDOO) y Java